Results 171 to 180 of about 1,870 (201)
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IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
After the recent outbreak of pine processionary moth (Thaumetopoea pityocampa) was observed in 2016, we attempted to estimate the damage severity in Catalonia, Spain. In this study pre-outbreak and post-outbreak images were obtained from Landsat 8 to capture the maximum defoliation period over winter.
Lluís Brotons
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After the recent outbreak of pine processionary moth (Thaumetopoea pityocampa) was observed in 2016, we attempted to estimate the damage severity in Catalonia, Spain. In this study pre-outbreak and post-outbreak images were obtained from Landsat 8 to capture the maximum defoliation period over winter.
Lluís Brotons
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Effect of Defoliation Severity on Regrowth and Nutritive Value of Perennial Ryegrass Dominant Swards
Agronomy Journal, 2008The height or mass to which swards are defoliated can potentially affect regrowth. A field study was undertaken to determine the response of perennial ryegrass (Lolium perenne L.) dominant swards to defoliation severity over repeated defoliations during a period of low water‐soluble carbohydrate (WSC) accumulation (late spring to mid‐autumn due to ...
J. M. Lee, D. J. Donaghy, J. R. Roche
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Effect of Time and Severity of Defoliation on Growth and Composition of 'Thompson Seedless' Grapes
American Journal of Enology and Viticulture, 1970W M Kliewer
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Defoliation Timing and Severity in Sugar Beet
Agronomy Journal, 1998AbstractDefoliation produced by different biotic and abiotic factors can reduce sugar beet (Beta vulgaris L.) sugar content and final yield production. Four trials were conducted to study the effect on sugar content and yield production of systematic defoliations carried out during the sugar beet growing cycle, in the Central Ebro Valley in Spain.
Julio Muro +2 more
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American Journal of Botany, 2023
AbstractPremiseInsect defoliation of trees causes unusual changes to wood anatomy and slows radial growth that decreases tree value; however, the characteristics of these anatomical changes in hardwoods remain unclear. The aim of this study was to characterize the anatomy and histochemistry of the wood in trunks of Betula maximowicziana trees after ...
Yoko Watanabe +5 more
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AbstractPremiseInsect defoliation of trees causes unusual changes to wood anatomy and slows radial growth that decreases tree value; however, the characteristics of these anatomical changes in hardwoods remain unclear. The aim of this study was to characterize the anatomy and histochemistry of the wood in trunks of Betula maximowicziana trees after ...
Yoko Watanabe +5 more
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THE FREQUENCY AND SEVERITY OF DEFOLIATION OF INDIVIDUAL TILLERS IN SET‐STOCKED SWARDS
Grass and Forage Science, 1969Individual tillers of S23 ryegrass, in three paddocks set‐stocked with sheep at widely differing grazing pressures, were marked and studied from 11 July to 19 August, 1966, and observations were made on the frequency and severity of grazing.The uprooting of tillers, and the destruction of others, were major sources of loss of records. It was found that
J. Hodgson, J. H. Ollerenshaw
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Survival and recovery of Eucalyptus globulus seedlings from severe defoliation
Forest Ecology and Management, 2016Abstract Catastrophic damage that occurs at the early establishment stage of eucalypts, such as decapitation by browsing mammals, may have deleterious effects on survival, growth and tree shape. Such damage may result in a significant loss of productivity from planted forests, as well as represent a major selective force shaping patterns of ...
Christina L. Borzak +2 more
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SEVERE DEFOLIATION OF SCOTS PINE REDUCES REPRODUCTIVE INVESTMENT BY ECTOMYCORRHIZAL SYMBIONTS
Ecology, 2003Reduction in the photosynthetic capacity of plants is presumed to negatively affect their fungal symbionts. To test this hypothesis under natural conditions, we artificially removed 100% of previous year needles in two successive years on Scots pine trees (Pinus sylvestris L.) to simulate pine sawfly attack.
Kuikka, Karita +8 more
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Integrated pest management of several forest defoliators in Taiwan
Forest Ecology and Management, 1991Abstract The main defoliators in plantation forests of Taiwan are the casaurina tussock moth (Lymantria xylina), the pine caterpillar (Dendrolimus punctatus), the leucaena psyllid (Heteropsylla cubana), the coconut leaf beetle (Brontispa longissima). Formosan alder leaf-beetle (Linaeidea formosana), and the bamboo mirid (Mecistoscellis scirteloides).
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The Effect of Insect Defoliation on the Presence and Severity of Fusarium Crown-Rot in Alfalfa
Journal of Entomological Science, 1990Alfalfa Medicago sativa L. (‘Fla. 77’) was inoculated with three different isolates of Fusarium and defoliated to varying levels with yellowstriped armyworms, Spodoptera ornithogalli (Guenée), to determine the effect of insect defoliation on the development of crown-rot under greenhouse conditions.
S. S. Quisenberry +2 more
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